To remediate the misconfiguration of S3 buckets not having lifecycle configuration enabled in AWS using AWS CLI, follow these steps:

1. Open a terminal window and install the AWS CLI if it is not already installed.
2. Authenticate the AWS CLI with your AWS account by running the following command:

   aws configure
   

   This will prompt you to enter your AWS Access Key ID, AWS Secret Access Key, default region name, and default output format.
3. Once authenticated, run the following command to enable lifecycle configuration for all S3 buckets in your AWS account:

   aws s3api put-bucket-lifecycle-configuration --bucket <bucket-name> --lifecycle-configuration file://lifecycle.json
   

   Replace <bucket-name> with the name of the S3 bucket that you want to enable lifecycle configuration for.
4. Create a JSON file named lifecycle.json and add the following content to it:

   {
     "Rules": [
       {
         "Status": "Enabled",
         "Prefix": "",
         "Expiration": {
           "Days": 365
         }
       }
     ]
   }
   

   This configuration will delete any objects in the bucket that are older than 365 days.
5. Repeat step 3 for each S3 bucket in your AWS account that does not have lifecycle configuration enabled.

By following these steps, you will enable lifecycle configuration for all S3 buckets in your AWS account, which will help you to automatically manage the lifecycle of your objects in the bucket.

To remediate this misconfiguration in AWS, you can use the following Python code to enable lifecycle configuration for all S3 buckets in your AWS account:

1. First, you need to import the necessary libraries:

import boto3
from botocore.exceptions import ClientError

2. Then, you need to create an S3 client:

s3 = boto3.client('s3')

3. Next, you need to get a list of all S3 buckets in your account:

buckets = []
response = s3.list_buckets()
for bucket in response['Buckets']:
    buckets.append(bucket['Name'])

4. For each bucket, you need to check if lifecycle configuration is already enabled:

for bucket in buckets:
    try:
        response = s3.get_bucket_lifecycle_configuration(Bucket=bucket)
        # If there is no exception, lifecycle configuration is already enabled
        print(f"Lifecycle configuration is already enabled for {bucket}")
    except ClientError as e:
        if e.response['Error']['Code'] == 'NoSuchLifecycleConfiguration':
            # If the exception is NoSuchLifecycleConfiguration, lifecycle configuration is not enabled
            print(f"Enabling lifecycle configuration for {bucket}")
            # Enable lifecycle configuration for the bucket
            s3.put_bucket_lifecycle_configuration(
                Bucket=bucket,
                LifecycleConfiguration={
                    'Rules': [
                        {
                            'Expiration': {
                                'Days': 30
                            },
                            'ID': 'Delete old objects',
                            'Status': 'Enabled',
                            'NoncurrentVersionExpiration': {
                                'NoncurrentDays': 7
                            }
                        }
                    ]
                }
            )
        else:
            # If the exception is something else, print the error message
            print(f"Error: {e}")

5. In the above code, we are enabling lifecycle configuration with a rule that deletes objects older than 30 days and noncurrent versions older than 7 days. You can modify this rule as per your requirements.

6. Finally, you can run this Python script to enable lifecycle configuration for all S3 buckets in your AWS account.